Views Inside A Lock

This is what you see in the lock as you lock through.  In this case, we have come into the lock and will be lowered about 35 feet to the level of the river on the other side of the doors ahead.

Please note the dark area on the lock side and on the doors in the background.  This dark area (recently wet) will get larger and larger until the water level has been dropped to the same as on the other side of the forward doors.  

Then, the doors open and we exit at the new level.  Anyone coming in the opposite direction can now come in, the doors will close, the water level will be pumped up the required 30 feet and the process is reversed in a new direction.